Na Ul made his debut with the vocal group Anthem in 1998, and rose to the top of the Korean pop industry in 2001 as a member of Brown Eyes with fellow musician Yoon Gun. He parted with Yoon thereafter, and is currently active as the main vocalist of Brown-Eyed Soul, which he formed in 2003. Most recently, he has released an album with remade celebrated Korean songs from the 1980s and 1990s including “The Way Home” and “After You’re Gone” into such black music genres as soul, R&B, hip hop and reggae. Na Ul plans to continue working with Brown-Eyed Soul, creating music in a retro, analog style like he has with the new album. The singer also said that he’ll keep pursuing music that gives off a distinctly human scent, rather than using mechanical sounds.

- It’s Already Been a Year (Brown Eyes 1st album, 2001) : It’s Already Been a Year, With Coffee, It Was Always Like That
- Reason 4 breathing? (Brown Eyes 2nd album, 2002) : Gradually, Don’t Leave, For You
- Brown-eyed Soul (1st album, 2003) : Did We Really Love Each Other, Brown Eyed Girl, My Everything
- Back To The Soul Flight (Remake album, 2005) : After You Left Me, Someday, Back To The Soul Flight, Sad Café, The life, The Butterfly Effect